The Cubs were turned off by Haren's medicals, according to an American League source who spoke to CSNChicago.com's Dave Kaplan. Most concerning was the back stiffness that put Haren on the disabled list for three weeks last July. Issues with Haren's hip were also a red flag, because they altered Haren's delivery, according to the source.

Dan Haren's ailments in 2011 are believed to have scared off the Cubs. (AP Photo)

"I've never missed any time because of injury other than the three weeks this year because of my back," Haren said in an email. "When I came back, I had to be cleared by doctors, so obviously, I was healthy.

"As for any other 'injury,' I've had very minor issues over the years, but nothing significant at all. My arm is in great shape, and physically, I'm in a very good place right now. I'm very, very confident that I will return to form next year."

The Angels declined Haren's $15.5 million contract option after they were unable to trade him. Haren is now a free agent. Kaplan reported that it does not appear the Cubs are interested in signing Haren.

In his email to DiGiovanna, Haren noted his durability.

"It's definitely a little frustrating to hear, being as I've started all but three games over a nine-year career," Haren wrote. "I haven't heard why exactly (the Cubs) pulled out, but I finished the year healthy and did pretty well down the stretch."